 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.bookmarkexplorer;

 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.jface.viewers.IStructuredSelection;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.internal.views.bookmarkexplorer.BookmarkMessages;

 /**
  * Opens a properties dialog allowing the user to edit the bookmark's description.
  */
 class EditBookmarkAction extends BookmarkAction {

     protected EditBookmarkAction(BookmarkNavigator view) {
         super(view, BookmarkMessages.Properties_text);
         PlatformUI.getWorkbench().getHelpSystem().setHelp(this,
                 IBookmarkHelpContextIds.BOOKMARK_PROPERTIES_ACTION);
         setEnabled(false);
     }

     private IMarker marker;

     public void run() {
         if (marker != null) {
             editBookmark();
         }
     }

     /**
      * Sets marker to the current selection if the selection is an instance of
      * <code>org.eclipse.core.resources.IMarker<code> and the selected marker's
      * resource is an instance of <code>org.eclipse.core.resources.IFile<code>.
      * Otherwise sets marker to null.
      */
     public void selectionChanged(IStructuredSelection selection) {
         marker = null;
         setEnabled(false);

         if (selection.size() != 1) {
             return;
         }

         Object o = selection.getFirstElement();
         if (!(o instanceof IMarker)) {
             return;
         }

         IMarker selectedMarker = (IMarker) o;
         IResource resource = selectedMarker.getResource();
         if (resource instanceof IFile) {
             marker = selectedMarker;
             setEnabled(true);
         }
     }

     private void editBookmark() {
         BookmarkPropertiesDialog dialog = new BookmarkPropertiesDialog(
                 getView().getSite().getShell());
         dialog.setMarker(marker);
         dialog.open();
     }
 }

